Home
Class 9
PHYSICS
A balloon filled with helium gas floats ...

A balloon filled with helium gas floats in a big closed jar which is connected to an evacuating pump. What will be your observation, if air from jar is pumped out? Explain your answer.

Text Solution

Verified by Experts

The correct Answer is:
Observation: The balloon will sink.
Explation : As air is jumped out from jar, the density of ari in jar decreases, so the upthrust on balloon decreases. As weight of balloon exceeds the upthrust on it, it sinks.
Promotional Banner

Topper's Solved these Questions

  • UPTHRUST IN FLUIDS, ARCHIMEDES' PRINCIPLE AND FLOATATION

    ICSE|Exercise EXERCISE 5(c) (Multiple Choice Question)|3 Videos

  • UPTHRUST IN FLUIDS, ARCHIMEDES' PRINCIPLE AND FLOATATION

    ICSE|Exercise EXERCISE 5(c) (Numerical)|9 Videos

  • UPTHRUST IN FLUIDS, ARCHIMEDES' PRINCIPLE AND FLOATATION

    ICSE|Exercise EXERCISE 5(B) (Numerical)|16 Videos

  • SOUND

    ICSE|Exercise TOPIC 2 Infrasonic and Ultrasonic Waves ( 3 Marks Questions) |3 Videos

Similar Questions

Explore conceptually related problems

Two similar balloons filled with helium gas are tied to L m long string. A body of mass m is tied to another ends of the strings. The balloons float on air at distance r . If the amount of charge on the ballons is same then the magnitude of charge on each balloon will be

A small pebble tied at one end of a string in placed near the periphery of a circular disc, at the centre of which the other end of the string is tied to a peg. The disc is rotating about an axis passing through its centre. (a) What will be your observation when you are standing outside the disc? Explain. (b) What will be your observation when you are standing at the centre of the disc? Explain.

A block of wood is floating in water in a closed vessel as shown in the figure. The vessel is connected to an air pump. When more air is pushed into the vessel, the block of wood floats with (neglect compressibility of water)

What is meant by 'speciation'? List four factors that could lead to speciation. Which of these factors cannot be a major factor in the speciation of asexually producing organisms? Explain your answer.

A light bulb and an open coil inductor are connected to an ac source through a key as shown in Fig. The switch is closed and after sometime, an iron rod is inserted inot the interior of the inductor. The glow of the ligth bulb (a) increases (b) decreases (c) is unchanged as the iron is inserted. Give your answer with reasosns. What will be your answer if ac source is replaced by dc source ?

A partially inflated balloon is placed inside a bell jar connected to a vacuum pump. On creating vacuum inside the bell jar, balloon gets more inflated. How does the pressure change : increase, decrease or remains same, inside the (a) bell jar and (b) balloon ?

a metal solid cylinder tied ot a thread is hanging from the hook of a spring balance. The cylinder is gradually immersed into water contaned in a jar. What changes do you expect in the readings of spring balance? Explain your answer.

An ideal gas is kept in a long cylindrical vessel fitted with a frictionless piston of cross-sectional area 10cm^(2) and weight 1kg.The vessel itself is kept in a big chamber containing air at atmospheric pressure 100kPa. The length of the gas column is 20cm.if the chamber is now completely evacuated by an exhaust pump, what will be the length of the gas column? Assume the tempaerature to remain constant throughout the process.

A beaker containing a liquid is kept inside a big closed jar. If the air inside the jar is continuously pumped out, the pressure in the liquid near the bottom of the liquid will

A microphone is connected to the Y-input of a C.R.O. Three different sounds are made in turn in front of the microphone. Their traces (a), (b) and (c) produced on the screen are shown in Fig. Which trace is due to the sound with the lowest pitch ? Explain your answer.

ICSE-UPTHRUST IN FLUIDS, ARCHIMEDES' PRINCIPLE AND FLOATATION-EXERCISE 5(c)
  1. A homogeneous block floats on water a. Partly immersed b. completely i...

    Text Solution

    |

  2. Fig shows the same block of wood floating in three different liquids A...

    Text Solution

    |

  3. What is the centre of buoyancy? State its position for a floating body...

    Text Solution

    |

  4. A balloon filled with helium gas floats in a big closed jar which is c...

    Text Solution

    |

  5. A block of wood is so loaded it just floats in water at room temperatu...

    Text Solution

    |

  6. A body of volume V and density PS, floats with volume v inside a liqui...

    Text Solution

    |

  7. Two identical pieces, one of ice (density =900kgm^(-3)) and other of...

    Text Solution

    |

  8. Why is floating ice less submerged in brine than in water?

    Text Solution

    |

  9. A man first swims in sea water and then in river water. (i) compare ...

    Text Solution

    |

  10. An iron nail sinks in water while an iron ship floats on water.Explain...

    Text Solution

    |

  11. What can you say about the average density of a ship floating on water...

    Text Solution

    |

  12. A piece of ice is floating in a glass vessel filled with water. How wi...

    Text Solution

    |

  13. A buoy is held inside water contained in a vessel by tying it with a t...

    Text Solution

    |

  14. A loaded cargo ship sails from sea water to river water? State and exp...

    Text Solution

    |

  15. Explain the following: a. Icebergs floating in sea are dangerous for...

    Text Solution

    |

  16. Explain the following: An egg sinks in fresh water, but floats in a s...

    Text Solution

    |

  17. Explain the following: A toy balloon filled with hydrogen rises to th...

    Text Solution

    |

  18. Explain the following: As a ship in harbour is being unloaded, it slo...

    Text Solution

    |

  19. Explain the following: A balloon filled with hydrogen rises to a cert...

    Text Solution

    |

  20. Explain the following: A ship submerges more as it sails from sea wat...

    Text Solution

    |